LX0-104 Flash Cards If you have or want to try a flash card program, I use Anki, which is a free program. link to anki: https://apps.ankiweb.net/ I have uploaded my Anki flash cards here for download https://upw.io/u5/LX0-104.apkg Below are all of the flash cards in text! Name the 4 X Window Servers currently available from …
Author Archives: vektorprime
1.1.d (i) ICMP Unreachables, and Redirects
The Internet control message protocol (ICMP) has many types of messages and codes (sub types). The two discussed below are Type 3 – Destination Unreachable, and Type 5 – Redirect as it relates to 1.1.d (i) ICMP unreachable, redirect. Type 3 – Destination Unreachable: This type of message is sent back to the source …
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1.1.c (iv) Impact of Microbursts
Microbursts are nanoseconds worth of traffic that are so small most monitoring solutions will not see them (they don’t poll often enough). Instead what you may notice is output queue tail drop. This becomes important when discussing how interfaces actually transmit data, on a 1 Gbps interface, a 100 Mbps flow is actually the interface …
1.1.c Flash Cards
Here is the ANKI package for the flash cards: https://upw.io/u4/&1.1.C_Network_Challenges.apkg If you prefer the text, please read below. What is unicast flooding, in simple terms. Unicast flooding is when a switche receives a unicast frame but has no entry in its CAM table for the destination MAC adress, thus treats the frame as broadcast. Simply …
1.1.c (iii) Asymmetric Routing
Asymmetric routing is when a packet does not return on the same path it took to the destination. This isn’t always an issue, some times it is by design. However there are certain scenarios where it can lead to issues: 1. Asymmetric routing can cause unicast flooding of traffic in very specialized conditions (worse if …
1.1.c (ii) Out of Order Packets
Out of order packets are caused by bad load balancing or per packet load balancing. Technologies like CEF avoid out of order packets by doing a really good PER FLOW load balancing/load sharing. For TCP: Out of order packets to a receiver are a waste of 1. bandwidth and 2. CPU cycles 1. Packets …